Q35 of 312 Page 221

Explain why, diamond can be used in rock drilling equipment but graphite cannot.

In diamond, each carbon atom is bonded to 4 other carbon atoms through strong covalent bonds. These four atoms form four vertices of a regular tetrahedron which form a rigid structure and thus make it hard. Hence, it is used in rock drilling equipments but graphite is soft and hence not used in rock drilling equipments.

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35 Write the points of different in the structure of diamond and graphite. 35 Explain why, graphite can be used as a lubricant but diamond and graphite. 35 State one use of diamond which depend on its ‘extraordinary brilliance’ and use of graphite which depends on its being ‘black and quite soft.’ 36 What is diamond? Of what substance is diamond made?